1116-22-9Relevant articles and documents
γ-Glutamyl-dipeptides: Easy tools to rapidly probe the stereoelectronic properties of the ionotropic glutamate receptor binding pocket
Tamborini, Lucia,Nicosia, Veronica,Conti, Paola,Dall'Oglio, Federica,De Micheli, Carlo,Nielsen, Birgitte,Jensen, Anders A.,Pickering, Darryl S.,Pinto, Andrea
, p. 8486 - 8492 (2016/11/28)
γ-Glutamyl-dipeptides, built by condensing the distal carboxylate of L-Glu (or D-Glu) onto a series of differently functionalized amino acids, were prepared and used as tools for rapidly probing the stereo-electronic properties of iGluRs, searching for subtype-selective ligands.
Efficient peptide couplings and their use in the synthesis and isolation of a cyclopenta (G) quinazoline trisodium salt
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Page/Page column 40; 41, (2016/10/24)
A new method for the synthesis of L-Glutamyl-γ-D-Glutamic acid and its use in the synthesis of (2R)-((4S)-carboxy-4-(4,N-(((6S)-2-(hydroxymethyl)-4-oxo-3,4,7,8-tetrahydro-3H-cyclopenta[g]quinazolin-6-yl)-N-(prop-2-ynyl)amino)benzamido)butanamido)pentanedioic acid, 1 are provided. Also provided is an efficient method for the isolation and purification of the trisodium salt of the abovementioned acid, 2, in a form suitable for long term storage and use in a parenteral dosing form.
Microstructure of poly(γ-glutamic acid) produced by Bacillus subtilis consisting of clusters of D- and L-glutamic acid repeating units
Wang, Fei,Ishiguro, Masaji,Mutsukado, Mai,Fujita, Ken-Ichi,Tanaka, Toshio
experimental part, p. 4225 - 4228 (2010/03/31)
Poly(γ-glutamic acid) (PGA) produced by a strain of Bacillus subtilis was partially hydrolyzed into various oligopeptides so that the dipeptide fraction was isolated by the preparative thin-layer chromatography. HPLC analysis was applied to the detection of each of the four stereoisomers in this fraction using chemically synthesized authentic samples. The fraction consisted of N-γ-D-glutamyl-D-glutamic acid, N-γ-L-glutamyl-L-glutamic acid, N-γ-D-glutamyl-L-glutamic acid, and N-γ-L-glutamyl-D-glutamic acid at a ratio of 5.9:6.0:1.0:1.0. On the basis of this result, a model was proposed for the microstructure of the bacterial PGA, in which D- and L-glutamic acid repeating units are alternately linked in a single chain of the molecule.
Synthesis of (6R)- And (6S)-5,10-dideazatetrahydrofolate oligo-γ-glutamates: Kinetics of multiple glutamate ligations catalyzed by folylpoly-γ-glutamate synthetase
Tomsho, John W.,McGuire, John J.,Coward, James K.
, p. 3388 - 3398 (2007/10/03)
Folylpoly-γ-glutamate synthetase (FPGS, EC 6.3.2.17) catalyzes the ATP-dependent ligation of glutamic acid to reduced folates including (6S)-5,6,7,8-tetrahydrofolate (H4PteGlu), as well as to anticancer drugs such as 5,10-dideaza-5,6,7,8-tetrahydrofolate ((6R)-DDAH 4PteGlu1, (6R)-DDATHF, Lometrexol(tm)). Synthesis of unlabeled mono- and polyglutamates, DDAH4PteGlu n (6R, n = 1-6; 6S, n = 1-2), as well as (6R)-DDAH 4Pte[14C]Glu1, was effected from (6R)- or (6S)-5,10-dideazatetrahydropteroyl azide and glutamic acid, H-Glu-γ- Glun-y-Glu-OH (n = 0-4), or [14C]glutamic acid, respectively. These compounds were evaluated as FPGS substrates to determine steady-state kinetic constants. Michaelis-Menten kinetics were observed for (6-R)-DDAH4PteGlu1, the isomer corresponding to H 4PteGlu, whereas marked substrate inhibition was observed for (6S)-DDAH4PteGlun (n = 1-2) and (6R)-DDAH 4PteGlun (n = 2-5), but not (6.R)-DDAH 4PteGlu6. Multiple ligation of glutamate renders a quantitative analysis of these data difficult. However, approximate values of KM = 0.65-1.6 μM and K1, = 144-417 μM for DDAH 4PteGln were obtained using a simple kinetic model. The Royal Society of Chemistry 2005.
Effective formation of di- and tri-gamma-glutamates by gamma-glutamyltranspeptidase.
Watanabe,Kohashi
, p. 115 - 116 (2007/10/02)
Using gamma-glutamyltranspeptidase, conditions for di- and tri-gamma-glutamates synthesis were studied with glutamine and glutamic acid esters as substrates. The reactivity of amino acid esters was higher than for free ones. The efficient conditions were the combination of glutamine ethyl and glutamate diethyl esters with a molar ratio of 1/10 at pH 7-8.
Action of Glutaminase in a Model System of a Soy Sauce Fermentation
Tomita, Kenji,Yano, Toshihiro,Kitagata, Tatsuichiro,Ando, Nobuyuki,Kumagai, Hidehiko,Tochikura, Tatsurokuro
, p. 1873 - 1878 (2007/10/02)
A model system was employed to investigate the role of glutaminase in soy sauce fermentation.In this system, a soybean protein was used as the starting material and a water extract of wheat bran koji was used as the enzyme preparation containing proteinases, peptidases, glutaminases and so on.A soybean protein was digested with the enzyme preparation. γ-Glutamylserine, γ-glutamylglutamic acid and γ-glutamylalanine were isolated from an acidic fraction of the soybean protein digest.The addition of the purified glutaminase from Aspergillus oryzae led to more production of glutamic acid and γ-glutamyl peptide and less production of glutamine and pyroglutamic acid. γ-Glutamyltranspeptidase activity and γ-glutamyl peptide(s) were also detected in a partical soy sauce mash.
Aspartyl and Glutamyl Peptides and the Acidic Cysteine Derivatives in Asparagus (Asparagus officinalis) Shoots
Kasai, Takanori,Hirakuri, Yoshihiro,Sakamura, Sadao
, p. 433 - 438 (2007/10/02)
γ-Glutamyl peptides and acidic cysteine derivatives were found in low concentrations in asparagus shoots.However, the presence of α- and β-aspartylaspartic acid, α-aspartylglutamic acid, γ-glutamylaspartic acid, γ-glutamylglutamic acid, γ-glutamyltyrosine, S-(2-carboxy-n-propyl)-L-cysteine and S-(1,2-dicarboxyethyl)-L-cysteine was demonstrated in the acidic amino acids fraction of asparagus shoots.
Synthesis of γ-Glutamyl Peptides Catalyzed by Transamidase from Bacillus natto
Noda, Kosaku,Igata, Keiko,Horikawa, Yoshiko,Fujii, Hisao
, p. 2419 - 2424 (2007/10/02)
Crude ammonium sulfate fraction of a cell free extract from Bacillus natto contained an enzyme (or enzymes) which catalyzed the transamidation reaction specific for glutamine.Both L- and D-isomers of glutamine were active as substrate.On incubation of L- or D-glutamine with the enzyme preparation, two peptides consisting of glutamic acid and glutamine were formed.The main component of the peptides was readily isolated by ion-exchange chromatography and identified as γ-glutamylglutamine by paper chromatography and by paper electrophoresis using authentic peptides.The optical configuration of the amino acid residues in the dipeptide was determined by digestion of the acid hydrolyzate with L-glutamic acid decarboxylase, and the result showed that the dipeptide obtained from L-glutamine was a L-L isomer, while the dipeptide from D-glutamine was a D-D isomer.